Thomas kibwan-



Patented May 12, 1885,.

T. KIRWAN.

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UNITED STATES PATENT OFFICE.

THOMAS KIRWAN, OF BOSTON, MASSACHUSETTS.

LOCK.

SPECIFICA'IIQN forming part of Letters Patent No. 317,547, dated May 12,1885.

(No model.)

To all whom it may concern.-

Be it known that I, THOMAS EKIRWAN, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented a new and useful Improvement in Locks, of which thefollowing is a specification.

My invention consists in certain improvements in locks, one of saidimprovements being that the bolt of thelock when not in use as a lock isheld by a catch, which catch, when released, allows a spring to throwout the bolt and lock the door, from which position it is returned tothe catch by means of a key, the key being only used to unlock the door.

Another improvement consists in a device by means of which, when locked,the bolt can be securely fastened from the inside of a door in such amanner that the lock cannot be picked from the outside or opened withits key-a matter of great importance in rooms to hotels andlodging-houses-nothing of a similar kind having, to my knowledge, yetbeen in use. 1

In the drawings I have shown the lock as connected with the latchpatented to me J anuary 25, 1881. Figure 1 shows a section through theline x w of Fig. 2; Fig. 2, a View of the inside of the lock with thecover broken away, said cover being shown in Fig. 3. Fig. 4 shows thecase of the lock with the bolt and latch thrown out. Figs. 5, 6, 7, 8,and 9 are variations of my device for holding the bolt when thrown out.

A represents the door, B B the case of the lock, 0 a latch, and D thebolt.

On the bolt D is a hasp, E, with which a spring'catch, G, attached tothe removable part B of the case, engages. A spring, H, working in achamber formed by a rib, J, on the bolt, and a rib, J, on the case B,serves to throw the bolt out when the spring-catch is released. From theoutside of the door a pin, K, passes through the caseand rests againstthe end of the catch G, and from the inside of the door another pin, K,passes through the catch G and screws into the pin K. By pressing thepin K or pulling the pin K the catch is released, and the spring Hthrows out the bolt, from which position it is returned to the catch bymeans of a key.

To fasten the door securely from the inside, so that the lock cannot bepicked, I perforate the case B and the bolt D, the perforations being soarranged that when the bolt is thrown out they will come opposite oneanother, and a pin thrust into them will prevent the operation of a keyor a lock-picking device.

(1 represents the perforation in the case, and b that in the bolt; 0,the pin, and d the escutcheon through which the pin works.

In Figs. 5 and 6 of the drawings I have shown the pin 0 as provided witha feather, e, the escutcheon being formed with a slot, 6, for allowingpassage therethrough of the same. The pin is also provided with ahelical spring, 0, which surrounds it, and bears between a shoulderformed by its enlarged end and the inner surface of the portion B of thecasing. By inserting the pin through the escutcheon against the actionof the spring 0' thereon, and then turning said pin until the feather isbrought behind the wall or front of said escutcheon, the pin ismaintained in a locked connection with the bolt, as will be apparent.

The escutcheon may be formed with a groove or screw on its inner side,and a stud be provided on the pin to move therein. (See f, Fig. 7.)Instead, however, of providing the stud on the pin, the latter may bescrew threaded to work in a corresponding surface in the escutcheon.

In Fig. 8 the escutcheon is represented as being double, in order toform a space and a covering for the pin-head, the outer portion thereofbeing perforated to admit a key, g, that enters the pin for operatingit.

I claim as my invention- 1. In a lock, the combination, with the easingprovided on its inner side with a springcatch and the rib J, of the boltformed with rib J and a hasp engaging the spring-catch, a spring workingin the space formed by the ribs, and the pins K K, passing through thecasing and spring-catch, whereby the latter may be released,substantially in the manner set forth and described.

2. In a lock, the combination,xvith a casing provided on its inner sidewith a spring-catch and rib J, and having perforation a, of a boltformed with a hasp and rib J, and provided with perforation b, thespring H, and a pin passing through one side of a door and into saidperforations in the casing and bolt, Whereby the latter is preventedfrom being thrown back from the opposite side of the door, substantiallyas described.

3. In a door-lock, the combination, with the spring-actuated bolt formedwith a hasp and the rib J, and the casing provided on its inner sidewith a spring-catch and the rib J, of the pins K K, passing through thecasing and spring-catch from opposite sides, and formed at theircontiguous ends to be united, the same adapted to operate thespring-catch for releasing the bolt, substantially as described.

4. The combination, with a lock having its THOMAS KIRW'AN.

WVitnesses:

O. G. COUILLARD, I CHAS. F. SLEEPER.

